Which of the following is the best evidence for a three-domain system?
A)Nucleotide sequences in ribosomal RNA vary between all three domains.
B)There are three distinctly different sets of metabolic reactions.
C)There are three distinctly different Gram reactions.
D)Some bacteria live in extreme environments.
E)There are three distinctly different types of nuclei.

Question

Quizplus · Accepted Answer

Nucleotide sequences in ribosomal RNA vary between all three domains. This is the most widely accepted evidence for the three-domain system, as it shows that the three domains (Bacteria, Archaea, and Eukarya) diverged from a common ancestor and have evolved distinct differences in their genetic material over time. The other options are not as strong evidence for the three-domain system.

Which of the Following Is the Best Evidence for a Three-Domain